Pliny the Elder and Pomponius Mela, on the other hand, say that Hyperboreans on the verge of old age died voluntarily.

Pliny, Natural History 4.12.89 (tr. H. Rackham):

Death comes to them only when, owing to satiety of life, after holding a banquet and anointing their old age with luxury, they leap from a certain rock into the sea: this mode of burial is the most blissful.

The Hyperboreans inhabit groves and forests, and when a sense of having been satisfied by life (rather than boredom) has gripped them, they cheerfully wreathe themselves in flowers and actually throw themselves into the sea from a particular cliff. For them that is the finest death ritual.